Roots/*bʰormo-bʰormo-“to buzz, murmur, drone”Debatedsoundvibrationmurmur, bombard, bombRoot yielding Latin murmur, also related to Greek bombos > bomb, bombard.Related Roots(s)teh₂n-“to thunder”(s)tenh₂-“to crash, to thunder”bʰleh₁-k-“to cry out, to bleat”bʰleh₁-s-“to blow, to blast”bʰrem-“to hum, to buzz, to make a low sound”gerH-“to cry out hoarsely, to call like a crane”gerh₂-₂“to cry, call out”gʰel-mn̥“a cry, a calling out”